Piston



F. JARDINE Aug. 1s, 1931.

PIsToN Filed Feb. 15,v 1929 Patented Aug. 18, 1931 UNIT-Eo STATES PAT ENroFF-ica FRANK JARDINE, 0F CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

THE CLEVELAND TRUST COMPANY, AS TRUSTEE, OF CLEVELAND, OHIO, A CORPO- RATION 0F OHIO PISTON Application filed February 15, 1929. Serial No. 340,088.

This invention relates to securing articles or elements of one article together and is particularly applicable to joining parts of' two different metals, where the parts of an article are such that one may be made of one metallic substance and the other may be cast thereabout. f f i An object of the,invention is to provlde a' simple and eilicient anchorageor connection by which two elements orv articles may be joined. ,i j Other objects will hereinafter appear.

The invention will be better understood from the description of one practical embodiment thereof, illustrated in the accompanying drawings, in which:

Fig. 1 is a central longitudinal sectional view of a piston having an insert in .the head thereof and attachedthereto by means embodying the invention;

liig. 2 is a central longitudinal sectional view of the piston of Figure l taken on the line II--II thereof, and

Fig... 3 is a bottom plan view of the piston of ythe 4above two. figures.'

The piston comprises a flat top or head l and downwardly extending cylindrical skirt 2 on the inner surfaces of which are formed piston pin bosses 3, the bosses and head bem0 reenforced by diametrically extending we s 4 andthe upper part of the skirt being provided with theusual piston ring grooves 5.

The piston illustrated -is of a type made of aluminum, aluminum alloy, or similar light materials, rwhich ex ands at a much higher rate than the cylin er in which it operates and,` therefore, is provided with means for preventing pistor slap when the parts are cold. This means comprises a` strut 6 'o'f steel or other material which .expands at a lower rate than the material of the piston and which In the manufacture, the strut is placed in the mold and the piston cast about the same, thus obviating the necessity for positioning and anchoring the strut after the piston has been formed. The strut Consists of a flat sheet of met-al 6 extending diametrically across the piston immediately under the head thereof in a plane substantially parallel to the head and in a direction at right angles to the projection of the wrist pin axis upon the` same.

'lhe strut may be provided with lightening holes 7 to reduce 'the weight thereof. Centrally of the strut it is provided with an aper-lthe aperture and the cross sectional area of Y the portion of the boss extending therethrough are relatively small so that differential expansion of the materials of which the strut and piston are composed do not materially-loosen the connection.

W'hile I have described the illustrated embodiment of my invention in some particularity obviously many others will readily occur to those skilled in the art to which this apperta'ins and I do not, therefore, limit myself to l/the precise details shown and described, but claim as my invention allenibol'" ments cgmingwithinftlscope of the apextends diametrically across the u perpartf pended"claims. y

thereof its ends projecting into the ottom-of one of the piston ring grooves so that the strut maintains the ring in this groove in an ex"- anded position in which it fits the cylinder 1n which the piston is 'operating so'closely that transverse movement of the pistons is prevented and sla even when the same is cold, is thereby eliminated.

Claims ,1. A piston comprising a metallic element having-an aperture therethrough surrounded by :1s-flange, and an element having a different coefficient of expansion and cast with a boss imbedding said flange and extending through the aperture.

2. A piston comprising a head, a cylindrieal skirt depending therefrom, piston ring grooves in the upper part of said skirt, and a transverse strut of a material having a different eoeiieient of expansion than the material of the piston and having its ends extending into one of the piston ring grooves,

the central portion of the strut being apertured and imbedded in a boss depending from the piston head.

3. A piston comprising a head, a cylindrical skirt depending therefrom, piston ring i grooves in the upper part of said skirt, and

a transverse strut of a material having a different eoeiiieient of expansion than the material of the piston and having its ends extending into one of the piston ring grooves, the Central portion of the strut being apertured and fianged about the aperture and said fiange imbedded in the material of said piston. Y

4. A piston comprising a substantially flat head a cylindrical skirt depending therefrom carrying piston pin bosses and provided on its exterior surface with piston ring grooves, a centrally depending boss of the lower 'surfave of said head, a transversely extending strut having its ends extending into one-0f the piston ring grooves and its center apertured and fianged, the Bange being imbedded 30 in the boss.

In testimony whereof I hereunto aiiix my signature this 4th day of February, 1929.

FRANK JARDINE. 

